Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quando a equipe visitante marcou 7.8 (50)?
 ###Tabelas: CREATE TABLE season_18:_1954 (season_18:_1954_id AUTO_INCREMENT PRIMARY KEY, Episode VARCHAR, Title VARCHAR, Writer(s) VARCHAR, Preservation VARCHAR, Original airdate VARCHAR) CREATE TABLE 2009_junior_classic_practice_times_and_leaderboard (2009_junior_classic_practice_times_and_leaderboard_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Rider VARCHAR, Mon 24 Aug VARCHAR, Tues 25 Aug VARCHAR, Wed 26 Aug VARCHAR, Thurs 27 Aug VARCHAR, Fri 28 Aug VARCHAR, Sat 29 Aug VARCHAR) CREATE TABLE torneo_clausura (torneo_clausura_id AUTO_INCREMENT PRIMARY KEY, Position INT, Team VARCHAR, Played INT, Wins INT, Draws INT, Losses INT, Scored INT, Conceded INT, Points INT) CREATE TABLE classification_of_algorithms (classification_of_algorithms_id AUTO_INCREMENT PRIMARY KEY, Counting Method VARCHAR, Basis VARCHAR, Name VARCHAR, Directed / Undirected VARCHAR, Induced / Non-Induced VARCHAR) CREATE TABLE round_13 (round_13_id AUTO_INCREMENT PRIMARY KEY, Home team VARCHAR, Home team score VARCHAR, Away team VARCHAR, Away team score VARCHAR, Venue VARCHAR, Crowd INT, Date VARCHAR)  
SELECT Date FROM round_13 WHERE Away team score = 7.8 (50)